While the wheelbase/overall length ratio is certainly valid, we went from a 41'Revolution LE to a 34' Ventana LE two years ago. I was concerned about the effect of crosswinds and passing trucks with the shorter motorhome. After 2 years and 17,000 miles including traveling across the country and back, I am extremely pleased with the way the Ventana handles under these conditions.
While it certainly is not quite as stable as the longer motorhomes, I have not found it objectionable at all. And this is said by a man who drove 40-41' motorhomes for over 14 years, and 180,000 miles.
My advice is if you find a shorter diesel pusher that you like, drive it and decide for yourself. That is the only true test.
Ed Headington